The various LDoN zones can contain containers.
Facts that I have positively determined.
1. If you get the message "You are unable to determine if..." when attempting detect trap, try and try again. You will eventually get a postive response one way or the other.
2. If you have determined that a box is trapped and disarm trap fails, try and try again. Eventualy you will succeed.
3. Catching a box in an AoE spell will set off the trap if it is trapped, even if the spell does not cause damage. AoE pacify will set a trap off!
Below is a summary of the different chests that I have found and what happened (listed by zone):